Lamp structure.



L1. FLANNERY & E. I. 'DODDS.

LAMP STRUCTURE. APPLICATION FILED SEPT- l3', I917- Patented Aug. 13, 1918.

INVENTORS 5 w S wxw ED STATES PATENT OFFICE- JAMES J. PLANNER-Y AND ETHAN I. DODDS, 0F PITTSBURGH, PENNSYLVANIA, ASSIGN- 035 1'0 FLANNEBY BOLT COMPANY, OF PITTSBURGH, PENNSYLVANIA.

LAMP STRUCTURE.

To all whom, it may concern Be it known that we, JAMES J. FLANNERY and ETHAN I. Donos, citizens of the United States, and residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Lamp Structures; and we do hereby declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

7 This invention relates to improvements in lamp structures and more particularly to such as may be used in places where they are subject to severe shocks,-one object of the invention being to provide a lamp which may be rendered luminous by means of artificial light supplied therein at intervals and for brief periods of time and to so construct such a lamp that it will withstand excessive shocks such as caused by concussion resulting from the firing of guns.

A further object is to provide a lam of the type specified which may be success ully used on submarines or other war ships without danger of rupture when the guns of the ship are fired.

-With these and other objects in view, the invention consists in certain novel features as hereinafter set forth and pointed out in the ClalInS. i

In the accompanying drawings; Figures 1, 2 and 3 are views illustrating the method of making the lamp; Fig. 4 is a view showing a completed lamp and-Fig. 5 is a view of a slight modification.

1 represents a transparent globe which may 'be made ofeglass and the glass may be colored if desir The wall of the globe is made quite thick so as to be capable of withstanding great shocks without becoming ruptured. Thus the globe 1 may be made from a, block of glass suitably shaped to form a bowl-like structure having a flanged upper edge 2, or, if desired the bowllike heavy globe 1 may be formed without a flange at its edge, and clips 3 employed to take the place of the flange as shown in Fig. 5.

The inner surface of the globe 1 is coated as at 4 with a phosphorescent material which will absorb light,viz., be activated or energized by artificial light to render it luminous and which will retain its luminos- Specification of Letters Patent.

ity for a considerable period after the artificial light shall have been extinguished.

'Such material may comprise zinc or calcium sulfid and a small quantity of radioactive material, .such as a salt of radium.

The globe 1 after having been coated with illuminating material as above explained, will be partly filled with a transparent plastic material 5, such as glue, gelatin or a thick syrup. An inner globe or tube 6 having one end closed, will then be pressed into the cavity of the outer globe 1, so that the transparent plastic material will constitute a filling between the two globes to prevent such relative vibration as would cause rupture in case of shock, and the surplus plastic-material will be forced out when the inner globe is being pressed into position, as illustrated in Fig. 3. a

When the inner globe shall have been pressed firmly 'into the outer globe, its flanged upper edge 7 will overlie the flanged upper edge 2 of said outer globe as shown in Fig. 4 or the clips 3 as shown in Fig. 5.

A sourc of artificial light is disposed within the inner globe or tube. This may consist of an incandescent electric lamp bulb 8, and the construction should be suc as will prevent rupture of the bulb when subjected to shock. This may be accomplished by providing a transparent filling 9 between the bulb and the inner globe or tube; Such filling may consist of plastic or glutinous mater1al,-shellac for example. The bulb 8 may be sealed in the globe structure by means of suitable cement aS indicated at 10.

Any suitable means may be provided for supplying current to the filament of the incandescent lamp bulb and for controlling the lighting and extinguishing of the same. To activate or energize the illuminating coating, it will be sufficient to maintain a light in the incandescent bulb for a very brief period of time, and to so light the bulb at intervals. The artificial light supplied by the bulb 8 will suflice to so actuate the coating that the latter will remain luminous for a considerable period, and afford sufiicient illumination for ordinary purposes where a mild light is desired.

Our improvements are particularly adapt- Patented Aug. 13, 1918..

Application filed September 13, 1917. Serial No. 191,200.

when the ships are in action, and where the economical use of electricity for llghting purposes is an important item. l

Having fully described our inventlon what we claim as new and desire to secure y Letters-Patent, is 1. A. lamp structure comprising a comparatively heavy globe, an inner lobe, a coating of phosphorescent material etween said lobes, a transparent filling between said g%obes, and a source of light within the inner globe. g

2. A lamp structure comprising a comparatively heavy outer globe having a coatmg of phosphorescent material on the inner face of said globe, an inner globe, a filling between said globes, and a source of light within the inner globe.

3. A lamp structure comprising an outer glo having a. thick wall, an inner globe,

. a ating of phosphorescent material beglobes,

between said an electric lamp within the inner globe and a filling between said electric lamp and the inner globe.

4. A lamp structure comprising an outer tween said globes, a filling globe having a thick wall, an inner globe, a

coatin of phosphorescent material between said g obes, a plastic filling between. said lamp within said inner 'forcing an inner globe globes, an electric lamp within the inner globe, and means for sapling said electric 5. A lamp structure c mprisin'g an outer globe and an inner globe with a coating of phosphorescent material between them, transparent means between said globes for preiventing relative movement of the same, an tained within the inner globe.

6. The herein described method of making a lampconsisting face of a globe having a thick wall with phosphorescent material, partly filling the globe with a transparent plastic material, into the outer globe whereby a transparent filling will 'be provided between said globes, and securing means providing a source of light within the inner globe.

In testimony whereof, We have signed this specification in the presence of two subscribing witnesses.

JAMES J. FLANNERY. ETHAN I. nonns.

Witnesses: F. H. ALmsoN,

EDWIN S. RICE.

means affording a, source of light conin" coating" the inner sur- 

